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Code Activity

Implementation of SUM(DISTINCT), tests cases

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sql/filesort.cc:
  Snippet of filesort() code moved to function reuse_freed_buff() - 
  change buffpek pointers to use buff from freed BUFFPEK
  Used in filesort() and merge_walk().
sql/item_sum.cc:
  Implementation of Item_sum_sum_distinct - SUM(DISTINCT) item, 
  which uses Unique to resolve duplicates
sql/item_sum.h:
  New sum Item added - Item_sum_sum_distinct - for SUM(DISTINCT) function
sql/sql_class.h:
  added walk() and reset() methods to Unique, used in Item_sum_sum_distinct.
sql/sql_sort.h:
  declaration for reuse_freed_buff() to be able to use it in uniques.cc
sql/sql_yacc.yy:
  parser extended to handle MIN(DISTICNT), MAX(DISTINCT), SUM(DISTINCT)
sql/uniques.cc:
  Implementation for Unique::reset(), Unique::walk() as well as for merge_walk() 
  algorithm.
This commit is contained in:
unknown
2003-12-19 19:04:03 +03:00
parent 844d9b766a
commit 58a52a2a84
9 changed files with 834 additions and 35 deletions
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sql/sql_sort.h
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@@ -78,3 +78,4 @@ int merge_buffers(SORTPARAM *param,IO_CACHE *from_file,
IO_CACHE *to_file, uchar *sort_buffer,
BUFFPEK *lastbuff,BUFFPEK *Fb,
BUFFPEK *Tb,int flag);
void reuse_freed_buff(QUEUE *queue, BUFFPEK *reuse, uint key_length);